Chemistry

A zinc-copper battery is constructed as follows at 25°C.
Zn|Zn^2+ (0.15 M)||Cu2+(3.00 M)|Cu

The mass of each electrode is 200. g.

a) Calculate the cell potential when this battery is first connected.
- i got this to be 1.14V

b.) Calculate the cell potential after 10.0 A of current has flowed for 10.0 h

(c) Calculate the mass of each electrode after 10.0 h.

d) How long can this battery deliver a current of 10.0 A before it goes dead?

please help! i just can't seem to figure out how to calculate the concentrations of the Zn^2+ and Cu^2+ after the current has flowed through.
-thanks.

  1. 👍
  2. 👎
  3. 👁
  1. Do you have a volume?
    10A x 10hrs x 3600 s/hr = 36,000 coulombs.
    96m485 C will dissolve (or plate out) 1 equivalent weight of a metal.
    1 equivalent weight of Zn = 65.38/2 = 31.3
    1 equivalent weight of Cu = 63.55/2 = 31.8
    Zn dissolved = 31.2 x (36,000/96,485) = ??
    Cu plated = 31.8 x (36,000/96,485) = ??
    ?? grams of each can be converted to moles but we need a volume to convert to molarity. I don't see that in the problem.

    1. 👍
    2. 👎
  2. yes, each half-cell contains 1.00 L of solution so that is the volume
    thank you!

    1. 👍
    2. 👎
  3. 10A x 10hrs x 3600 s/hr = 36,000 coulombs.

    You forgot to multiply by 10A...it should be 360,000 coulombs. 36,000 is seconds in 10 hours.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Chemistry

    For the following balanced equation: 2 Ag+ (aq) + Cu(s) ---> Cu2+ (aq) + 2 Ag(s) Which letter corresponds to the correct cell notation at standard state conditions? A. Cu2+(aq)/ Cu(s) // Ag(s) / Ag+(aq) B. 2Ag+(aq)/ Cu2+(aq)//

  2. Chemistry

    If a copper sample containing some zinc impurity is to be purified by electrolysis, the anode and the cathode must be which of the following? a. anode: pure copper cathode: pure zinc b. anode: pure zinc cathode: pure copper c.

  3. ALgebra

    Brass is an alloy formed from copper and zinc in the ratio 3:2, based on weight. If 120g of copper is needed for a certain piece of brass, how much zinc will be needed?

  4. Chemistry

    A battery is constructed based on the oxidation of magnesium and the reduction of Cu^2+. The initial concentrations of Mg^2+ and Cu^2+ are 1.2*10^-4M and 1.5M, respectively, in 1.0-L half-cells. The initial voltage of the battery

  1. chemistry

    if you're given a chart of half cell potentials (reduction potentials), how can you figure out which metals produce the highest voltage? For ex. Cadmium (Cd) with copper (Cu) Silver (Ag) with zinc (Zn) Lead (Pb) with zinc (Zn)

  2. Chemistry

    For the cell diagram Pt(s)|H2(g)|H+(aq)||Cu2+(aq)|Cu(s) Write a balanced equation for the half-reaction at the cathode. The cathode is the site of reduction so copper gets reduced. So wouldn't the answer be: Cu2+(aq) -> Cu(s) +

  3. Chemistry

    Zinc has three major and two minor isotopes. For this problem, assume that the only isotopes of zinc are the major ones, zinc-64, zinc-66, and zinc-68. The atomic mass of zinc-64 is 63.9291 Da, that of zinc-66 is 65.9260 Da, and

  4. Honors Chemistry

    We did the gold penny lab, where we bathed a copper penny in a hot zinc-NaOH mixture to turn it a silver color, then we heated that in a flame to turn it a gold color. There are two questions that go with this lab that I don't

  1. college chemistry

    A zinc-copper battery is constructed as follows: Zn | Zn+2(0.10 M) || Cu+2 (2.50 M)| Cu The mass of each electrode is 200.0 g. Each half cell contains 1.00 liter of solution. a) Calculate the cell potential when this battery is

  2. chemistry - Science

    A zinc-copper battery is constructed as follows (standard reduction potentials given below): Zn | Zn2+ (0.10 M) || Cu2+ (2.50 M) | Cu Zn2+ + 2 e- → Zn(s) Eº = -0.76 V Cu2+ + 2 e- → Cu(s) Eº = 0.34 V The mass of each

  3. Multiple Choice

    Physics 2. Which of the following is equivalent to one ampere? (Points : 1) 10 s/10 C 10 C/10 m 1.5 C/1.5 s 15 C/10 s Question 3.3. A stream of moving charges results in a current of 5.6 A. How long does 116 C of charge take to

  4. general chemistry

    I need the oxidation half reactions, reduction half reactions, and net ionic equations for the following reactions: 1)magnesium +0.1M zinc sulfate 2)copper+0.1M zinc sulfate 3)zinc+0.1M copper(II)sulfate 4)zinc+3M HCl 5)copper+3M

You can view more similar questions or ask a new question.